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Ophthalmologic apparatus and ophthalmologic method

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Ophthalmologic apparatus and ophthalmologic method


In order to automatically determine whether an eye to be inspected is an IOL eye by using bright spot images on a cornea for inspection at high accuracy, an ophthalmologic apparatus is provided with: a light beam projecting unit for projecting a light beam on the cornea of the eye to be inspected; a light receiving unit including an image pickup element for receiving a reflection light beam obtained by reflection of the light beam projected by the projecting unit to obtain cornea bright spot images from the cornea of the eye to be inspected; and an IOL eye determining unit for determining whether the eye to be inspected is the IOL eye based on the cornea bright spot images received by the light receiving unit.
Related Terms: Cornea Inspect

USPTO Applicaton #: #20140028978 - Class: 351208 (USPTO) -


Inventors: Wataru Sakagawa, Kazuaki Umekawa, Hiroshi Itoh

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The Patent Description & Claims data below is from USPTO Patent Application 20140028978, Ophthalmologic apparatus and ophthalmologic method.

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BACKGROUND OF THE INVENTION

1. Field of the Invention

The present invention relates to an ophthalmologic apparatus for measuring ocular characteristics of an eye to be inspected or acquiring an image of the eye to be inspected, and to an ophthalmologic method for obtaining the ocular characteristics of the eye to be inspected.

2. Description of the Related Art

In recent years, with the popularization of intraocular lenses (IOL) used for cataract surgeries, there are an increased number of an eye to be inspected having an intraocular lens implanted therein (IOL eye). An IOL has different characteristics than a crystalline lens in terms of its shape and material, the presence/absence of refractive power adjustability, and the like. Therefore, in order to inspect the IOL eye with high accuracy, an apparatus needs to acquire information on whether the eye to be inspected is the IOL eye.

There has been known a technology in which, in an ophthalmologic reflectometer, an inspector provides an input on whether the eye to be inspected is the IOL eye to the reflectometer and the reflectometer switches the function of a jog dial depending on the input (Japanese Patent No. 3244873). Therefore, for the IOL eye that generally tends to undergo miosis, the inspector may adjust the light amount of a fixation target with the jog dial.

There has been known a technology in which, in an ophthalmologic image acquiring apparatus, the apparatus determines, based on the color of the flare, whether the eye to be inspected is the IOL eye to switch the focusing method (Japanese Patent Application Laid-Open No. 2003-290146). Therefore, precise focusing can be performed for the IOL eye that generally tends to generate the flare.

There has also been known a technology in which, in an apparatus for measuring eye axial length, the apparatus determines, based on reflection signals from an anterior ocular segment of the eye to be inspected, whether the eye to be inspected is the IOL eye to use a more appropriate method for calculating the eye axial length (Japanese Patent Application Laid-Open No. 2011-136109).

Meanwhile, there has been known a technology in which, irrespective of whether the eye to be inspected is the IOL eye, for the purpose of preventing malfunction of an alignment operation, images in an on state and an off state of a light source are compared (Japanese Patent Application Laid-Open No. 2009-172155).

However, it has not been possible for the apparatus to use a bright spot image on a cornea to automatically determine whether the eye to be inspected is the IOL eye. Therefore, even with an apparatus that can obtain the bright spot image on the cornea, it has been necessary for the inspector to provide the input on whether the eye to be inspected is the IOL eye as in the configuration disclosed in Japanese Patent No. 3244873, and there has been a risk that the inspection fails due to a mistake or an input error of the inspector. There have also been problems in that such input operation places a burden on the inspector and in that the measurement time increases.

SUMMARY

OF THE INVENTION

The present invention has been made in view of the above-mentioned circumstances, and therefore is to provide an ophthalmologic apparatus or an ophthalmologic method that enables automatic determination of whether an eye to be inspected is an IOL eye by utilizing bright spot images on a cornea.

Note that, without limiting to the above-mentioned apparatus and method, providing actions and effects that are obtained by configurations described below in the “Description of the Embodiments” section and that cannot be obtained by the conventional technologies can also be regarded as another aspect of the present invention.

In order to solve the above-mentioned problems, an ophthalmologic apparatus according to one embodiment of the present invention includes: a projecting unit for projecting a light beam to an eye to be inspected; and a determining unit for determining whether or not a bright spot image based on a reflection light beam obtained by reflection of the light beam on the eye to be inspected is a bright spot image generated by an intraocular lens.

According to the present invention, the automatic determination on whether the eye to be inspected is the IOL eye is enabled by utilizing the bright spot images on the cornea. Therefore, the risk that the inspection fails due to the mistake or the input error of the inspector is reduced, and because the input operation is unnecessary, effects that the burden on the inspector is reduced and that the inspection time may be reduced may be obtained.

Further features of the present invention will become apparent from the following description of exemplary embodiments with reference to the attached drawings.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a diagram illustrating an example of an appearance of an ophthalmologic reflectometer according to a first embodiment of the present invention.

FIG. 2 is a diagram illustrating an example of an optical system arrangement of the first embodiment illustrated in FIG. 1.

FIG. 3 is a perspective view illustrating an example of an alignment prism stop of the first embodiment illustrated in FIG. 1.

FIG. 4 is a diagram illustrating an example of system blocks of the ophthalmologic reflectometer according to the first embodiment of the present invention.

FIG. 5 is a diagram illustrating an example of image forming positions of bright spot images obtained by the ophthalmologic reflectometer exemplified in the first embodiment.

FIGS. 6A and 6B are diagrams illustrating examples of anterior ocular segment images obtained by the ophthalmologic reflectometer exemplified in the first embodiment, of which FIG. 6A illustrates an anterior ocular segment image of a non-IOL eye, and FIG. 6B illustrates an anterior ocular segment image of an IOL eye.

FIG. 7 is a flow chart illustrating an example of IOL eye determination in ophthalmologic image acquisition according to the first embodiment of the present invention.

FIGS. 8A and 8B are diagrams illustrating examples of anterior ocular segment images obtained by an apparatus according to a second embodiment of the present invention, of which FIG. 8A illustrates an anterior ocular segment image of a non-IOL eye, and FIG. 8B illustrates an anterior ocular segment image of an IOL eye.

FIG. 9 is a flow chart illustrating an example of IOL eye determination in ophthalmologic image acquisition according to the second embodiment of the present invention.

DESCRIPTION OF THE EMBODIMENTS First Embodiment

The present invention is described in detail based on illustrated embodiments.

FIG. 1 is a schematic configuration diagram of an ophthalmologic reflectometer, which is an example of an ophthalmologic apparatus according to the present invention.

A frame 102 is movable in a left-right direction (X-axis direction of FIG. 1) with respect to a base 100. An X axis motor 103 is rotated to move the frame 102 in the left-right direction via a feed screw (not shown) and a nut (not shown). A frame 106 is movable in an up-down direction (Y-axis direction of FIG. 1) with respect to the frame 102. A Y axis motor 104 is rotated to move the frame 106 in the up-down direction via a feed screw 105 and a nut 114. A frame 107 is movable in a front-back direction (Z-axis direction of FIG. 1) with respect to the frame 106. A motor 108 is rotated to move the frame 107 in the front-back direction via a feed screw 109 and a nut 115.

On the frame 107, a measurement unit 110 for measurement is fixed. On the base 100, a joystick 101 for controlling a position of the measurement unit 110 is provided. Below the joystick 101, a jog dial 113 for setting a vertex distance by being rotated is provided.

When an eye refractive power is to be measured, a subject places his/her chin on a chin rest 112 and pushes his/her forehead to a forehead rest portion of a face rest frame (not shown) fixed to the base 100, and hence a position of an eye to be inspected can be fixed.

On an end portion of the measurement unit 110 on an inspector side, there is provided an LCD monitor 116 as a display member for observing an eye to be inspected E, which can display a measurement result and the like.

FIG. 2 is an arrangement diagram of an optical system arranged inside the measurement unit 110.

An optical path 01 from an eye refractive power measurement light source 201 emitting light having a wavelength of 880 nm to the eye to be inspected E is an optical axis of the reflectometer. On the optical path 01, there are arranged a lens 202, a stop 203 substantially conjugate with a pupil Ep of the eye to be inspected E, a perforated mirror 204, a diffuser panel 222 that can be inserted and extracted, a lens 205, and a dichroic mirror 206 that totally reflects visible light from the eye to be inspected E side and partially reflects a light beam having a wavelength of 880 nm, in this order. Note that, the wave length is not limited to the above-mentioned value.

On an optical path 02 in the reflection direction of the perforated mirror 204, there are arranged an eye refractive power measurement stop 207, a light beam separation prism 208, a lens 209, and an image pickup element 210, in this order. When eye refractive power is to be measured, the translucent diffuser panel 222 is arranged outside the optical path by a diffuser panel insertion/extraction solenoid 410 (see FIG. 4). A light beam emitted from the measurement light source 201 is restricted by the stop 203 and primarily forms an image on the lens 202 before the lens 205. Then, after being transmitted through the lens 205 and the dichroic mirror 206, the light beam is projected to the pupil center of the eye to be inspected E.

The light beam forms an image on a fundus Er, and reflection light thereof is transmitted through the pupil center and enters the lens 205 again. The entering beam is transmitted through the lens 205 and then is reflected by a periphery of the perforated mirror 204.

The reflected beam is separated by pupil separation in the eye refractive power measurement stop 207 substantially conjugate with the pupil Ep of the eye to be inspected E and the beam separation prism 208. Because the eye refractive power measurement stop 207 has a ring-like slit, the light beam separated by pupil separation is projected as a ring image to a light receiving plane of the image pickup element 210.

When the eye to be inspected E is an emmetropic eye, this projected ring image becomes a predetermined circle. When the eye to be inspected E is a short-sighted eye, the projected circle becomes smaller than that in the emmetropic eye. When the eye to be inspected E is a long-sighted eye, the projected circle becomes larger than that in the emmetropic eye. When the eye to be inspected E has astigmatism, the projected ring image becomes an ellipse in which an angle formed between a horizontal axis and a major axis or a minor axis of the ellipse is an astigmatic axis angle. Based on a coefficient of this ellipse, the refractive power is determined.

On the other hand, in the reflection direction of the dichroic mirror 206, there are arranged a fixation target projecting optical system and an alignment light receiving optical system used for both anterior ocular segment observation and alignment detection of the eye to be inspected.

On an optical path 03 of the fixation target projecting optical system, there are arranged a lens 211, a dichroic mirror 212, a lens 213, a reflection mirror 214, a lens 215, a fixation target 216, and a fixation target light source 217 in the stated order.

When the fixation target control is performed, a projection light beam from the turned-on fixation target light source 217 illuminates the fixation target 216 from the backside, and is projected to the fundus Er of the eye to be inspected E via the lens 215, the reflection mirror 214, the lens 213, the dichroic mirror 212, and the lens 211. Note that, the lens 215 can be moved in an optical axis direction by a fixation target drive motor 224 which performs diopter drive control so as to realize a fogged state of the eye to be inspected E.

On an optical path 04 in the reflection direction of the dichroic mirror 212, there are arranged an alignment prism stop 223, a lens 218, and an image pickup element 220 in the stated order.

Light beams of an anterior ocular segment image of the eye to be inspected E illuminated by anterior ocular segment illuminating light sources 221a and 221b each having a wavelength of about 780 nm form images on the image pickup element 220 via the dichroic mirror 206, the lens 211, the dichroic mirror 212, and the alignment prism stop 223. The wavelength of the light emitted from each of the anterior ocular segment illuminating light sources 221a and 221b is not limited to the above-mentioned value.

When alignment is to be performed, the diffuser panel 222 is inserted by a diffuser panel insert/remove solenoid 410 (not shown) in the optical path. The insertion position is substantially the position at which the measurement light source 201 primarily forms the image by the projection lens 202, and is a focal position of the lens 205.

A light source for detecting the alignment is used also as the measurement light source 201 for measuring the eye refractive power described above. An image of the measurement light source 201 is once formed on the diffuser panel 222, and the image becomes a secondary light source so that the lens 205 projects a thick collimated light beam toward the eye to be inspected E. The collimated light beam is reflected by a cornea Ef of the eye to be inspected, and a part of the reflection light beam is reflected again by the dichroic mirror 206 and forms an image on the image pickup element 220 via the lens 211, the dichroic mirror 212, the alignment prism stop 223, and the lens 218.

FIG. 3 illustrates a shape of the alignment prism stop 223.

Three apertures 223a, 223b, and 223c are formed in a disk-shaped stop plate, and alignment prisms 301b and 301c, each of which transmits only a light beam having a wavelength of around 880 nm, are affixed to the apertures 223b and 223c on the dichroic mirror 212 side. The wavelength to be transmitted by each of the alignment prisms 301b and 301c is not limited to the above-mentioned value.

FIG. 4 is a system block diagram.

A basic flow of the eye refractive power measurement is described with reference to FIG. 4. A system control portion 401 that controls the entire system includes a program storage portion, a data storage portion, an input and output control portion for controlling input and output with various devices, and a calculation processing portion for calculating data obtained from various devices.

First, the system control portion 401 turns on the measurement light source 201, the anterior ocular segment illuminating light sources 221a and 221b, and the fixation target light source 217 via a light source drive circuit 413 to perform alignment and prepare for IOL eye determination and refractive power measurement.



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stats Patent Info
Application #
US 20140028978 A1
Publish Date
01/30/2014
Document #
13950617
File Date
07/25/2013
USPTO Class
351208
Other USPTO Classes
351206, 351246
International Class
61B3/15
Drawings
8


Cornea
Inspect


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